Understanding APIICP653 Reading 2-650-Selected Reading
Understanding APIICP653 Reading 2-650-Selected Reading
Understanding APIICP653 Reading 2-650-Selected Reading
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A. Calculation questions will be oriented toward existing tanks, not new<br />
tanks. API Authorized AST Inspectors should be able to check and<br />
perform calculations included in the following categories:<br />
2. JOINT EFFICIENCIES<br />
The inspector must be able to determine the joint efficiency, "E", of a tank<br />
weld. Inspector should be able to determine:<br />
a) Joint Types (API-653 Section 4, Table 4-2)<br />
b) Type and extent of radiography performed (API 653, Table 4-2, Section 12;<br />
API <strong>650</strong>, Section 8.1, Figure 8-1)<br />
c) Joint efficiency by reading API-653, Table 4-2<br />
Determining joint efficiency may be part of a minimum thickness or maximum<br />
fill height problem since joint efficiency, "E", is used in the formulas for<br />
determining required thickness. (API-653, 4.3.3.1)<br />
Charlie Chong/ Fion Zhang
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